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Message: <blockquote data-quote="ess530i" data-source="post: 299017" data-attributes="member: 13496"><p>my mistake guys...shouldn't have made the conclusion so soon that v-power equals primax. now i remember that when i switched from v-power to primax 2 days ago, i still had 1/5 tank of v-power so it was actually a blend. today i filled up with primax neat and actually noticed some loss of power. my engine did take advantage of the slight increase in octane from the 1/5 tank of v-power which is why i felt no difference when i 'switched'. guess the conclusion is that e60 530i transmission can only take up to about 340hp/420NM of torque and anything more will probably damage it. sad part is that i cant modify my car anymore until i change to a 6-speed manual!</p></blockquote><p></p>